fix: exclude Fable model env from Claude common config (#4272) (#5206)

* Add test for Fable model env key exclusion

Add regression test to ensure Fable model env keys are excluded from common config.

* Add Fable model to CLAUDE_MODEL_OVERRIDE_ENV_KEYS

* Add files via upload

* Delete .github/workflows/build-windows-unsigned.yml

src-tauri/src/services/provider/mod.rs

@@ -775,6 +775,56 @@ mod tests {
         assert_eq!(value.get("includeCoAuthoredBy"), Some(&json!(false)));
     }
 
+    /// Regression for issue #4272: Fable tier env keys must not enter the shared
+    /// Claude common-config snippet (same class as haiku/sonnet/opus model pins).
+    #[test]
+    fn extract_claude_common_config_strips_fable_model_env_keys() {
+        let settings = json!({
+            "env": {
+                "ANTHROPIC_DEFAULT_HAIKU_MODEL": "haiku-mapped",
+                "ANTHROPIC_DEFAULT_HAIKU_MODEL_NAME": "Haiku Mapped",
+                "ANTHROPIC_DEFAULT_SONNET_MODEL": "sonnet-mapped[1M]",
+                "ANTHROPIC_DEFAULT_SONNET_MODEL_NAME": "Sonnet Mapped",
+                "ANTHROPIC_DEFAULT_OPUS_MODEL": "opus-mapped[1M]",
+                "ANTHROPIC_DEFAULT_OPUS_MODEL_NAME": "Opus Mapped",
+                "ANTHROPIC_DEFAULT_FABLE_MODEL": "deepseek-v4-flash[1M]",
+                "ANTHROPIC_DEFAULT_FABLE_MODEL_NAME": "deepseek-v4-flash",
+                "ANTHROPIC_MODEL": "default-mapped",
+                "ENABLE_TOOL_SEARCH": "true"
+            },
+            "theme": "dark"
+        });
+
+        let snippet = ProviderService::extract_claude_common_config(&settings)
+            .expect("extract should succeed");
+        let value: Value = serde_json::from_str(&snippet).expect("snippet is valid JSON");
+        let env = value.get("env");
+
+        for stripped in [
+            "ANTHROPIC_DEFAULT_HAIKU_MODEL",
+            "ANTHROPIC_DEFAULT_HAIKU_MODEL_NAME",
+            "ANTHROPIC_DEFAULT_SONNET_MODEL",
+            "ANTHROPIC_DEFAULT_SONNET_MODEL_NAME",
+            "ANTHROPIC_DEFAULT_OPUS_MODEL",
+            "ANTHROPIC_DEFAULT_OPUS_MODEL_NAME",
+            "ANTHROPIC_DEFAULT_FABLE_MODEL",
+            "ANTHROPIC_DEFAULT_FABLE_MODEL_NAME",
+            "ANTHROPIC_MODEL",
+        ] {
+            assert!(
+                env.and_then(|e| e.get(stripped)).is_none(),
+                "provider-specific model key {stripped} must not enter common config"
+            );
+        }
+
+        assert_eq!(
+            env.and_then(|e| e.get("ENABLE_TOOL_SEARCH"))
+                .and_then(|v| v.as_str()),
+            Some("true")
+        );
+        assert_eq!(value.get("theme").and_then(|v| v.as_str()), Some("dark"));
+    }
+
     #[test]
     fn validate_provider_settings_rejects_negative_cost_multiplier() {
         let mut provider = Provider::with_id(
@@ -2869,6 +2919,10 @@ impl ProviderService {
             "ANTHROPIC_DEFAULT_OPUS_MODEL_NAME",
             "ANTHROPIC_DEFAULT_SONNET_MODEL",
             "ANTHROPIC_DEFAULT_SONNET_MODEL_NAME",
+            // Fable 是 v3.16.3 新增的第四档模型映射，与 haiku/sonnet/opus 同属供应商专属，
+            // 不得进入通用配置片段，否则会污染其它供应商（issue #4272）。
+            "ANTHROPIC_DEFAULT_FABLE_MODEL",
+            "ANTHROPIC_DEFAULT_FABLE_MODEL_NAME",
             "CLAUDE_CODE_SUBAGENT_MODEL",
             "ANTHROPIC_BASE_URL",
         ];

src-tauri/src/services/proxy.rs

@@ -26,7 +26,7 @@ const PROXY_TOKEN_PLACEHOLDER: &str = "PROXY_MANAGED";
 /// 原因：接管模式下 `*_MODEL` 必须由 CC Switch 写成稳定的 Claude 角色别名，
 /// 再由本地代理映射到当前供应商真实模型；`*_MODEL_NAME` 也需要同步接管，
 /// 否则 Claude Code 模型菜单会残留上一个供应商的显示名称。
-const CLAUDE_MODEL_OVERRIDE_ENV_KEYS: [&str; 10] = [
+const CLAUDE_MODEL_OVERRIDE_ENV_KEYS: [&str; 12] = [
     "ANTHROPIC_MODEL",
     "ANTHROPIC_REASONING_MODEL", // legacy: 已废弃，但旧配置可能残留
     "ANTHROPIC_DEFAULT_HAIKU_MODEL",
@@ -35,6 +35,8 @@ const CLAUDE_MODEL_OVERRIDE_ENV_KEYS: [&str; 10] = [
     "ANTHROPIC_DEFAULT_SONNET_MODEL_NAME",
     "ANTHROPIC_DEFAULT_OPUS_MODEL",
     "ANTHROPIC_DEFAULT_OPUS_MODEL_NAME",
+    "ANTHROPIC_DEFAULT_FABLE_MODEL",
+    "ANTHROPIC_DEFAULT_FABLE_MODEL_NAME",
     "ANTHROPIC_SMALL_FAST_MODEL", // Legacy key (已废弃)：历史版本使用该字段区分 small/fast 模型
     "CLAUDE_CODE_SUBAGENT_MODEL",
 ];
@@ -42,6 +44,7 @@ const CLAUDE_MODEL_OVERRIDE_ENV_KEYS: [&str; 10] = [
 const CLAUDE_TAKEOVER_HAIKU_MODEL: &str = "claude-haiku-4-5";
 const CLAUDE_TAKEOVER_SONNET_MODEL: &str = "claude-sonnet-4-6";
 const CLAUDE_TAKEOVER_OPUS_MODEL: &str = "claude-opus-4-8";
+const CLAUDE_TAKEOVER_FABLE_MODEL: &str = "claude-fable-5";
 // 写给 Claude Code 时沿用文档示例的大写形式；解析侧大小写不敏感。
 const CLAUDE_ONE_M_MARKER_FOR_CLIENT: &str = "[1M]";
 
@@ -221,10 +224,12 @@ impl ProxyService {
         let opus_model = Self::claude_env_string(env, "ANTHROPIC_DEFAULT_OPUS_MODEL")
             .or(default_model)
             .or(small_fast_model);
+        // Fable 未配置时不写稳定别名；映射侧会 fable→opus 降级（与官方一致）。
+        let fable_model = Self::claude_env_string(env, "ANTHROPIC_DEFAULT_FABLE_MODEL");
 
         let subagent_model = Self::claude_env_string(env, "CLAUDE_CODE_SUBAGENT_MODEL");
 
-        let mut fields = Vec::with_capacity(7);
+        let mut fields = Vec::with_capacity(9);
         Self::push_claude_takeover_role_fields(
             &mut fields,
             env,
@@ -252,6 +257,15 @@ impl ProxyService {
             true,
             opus_model,
         );
+        Self::push_claude_takeover_role_fields(
+            &mut fields,
+            env,
+            "ANTHROPIC_DEFAULT_FABLE_MODEL",
+            "ANTHROPIC_DEFAULT_FABLE_MODEL_NAME",
+            CLAUDE_TAKEOVER_FABLE_MODEL,
+            true,
+            fable_model,
+        );
         if let Some(subagent_model) = subagent_model {
             fields.push(("CLAUDE_CODE_SUBAGENT_MODEL", subagent_model.to_string()));
         }